乳化聚合反應合成親疏水性活性接枝型共聚物

Emulsion Polymerization of Hydrophilic/Hydrophibic Living Graft Copolymer

周政杰(Cheng-Chieh Chou)

指導教授 ： 邱文英

國立臺灣大學/工學院/材料科學與工程學研究所/碩士(2004年)

https://doi.org/10.6342/NTU.2004.00536

摘要

本研究分為兩部分，首先以活性自由基TEMPO與起始劑KPS進行聚合反應，製備具有精確分子量的水溶性聚合物PSSNa，將PSSNa進行GPC分析其特性，量測活性自由基聚合物的分子量、分子量分佈、與轉化率，並且對TEMPO/KPS與SSNa/KPS不同比例的反應條件進行探討。最後在PSSNa的末端接上交聯劑DVB。
第二部分藉著DVB的雙鍵特性在低溫下與styrene（St）進行乳化聚合反應，形成親疏水性的接枝型共聚物。並探討超音波、介質的種類與比例、反應溫度、PSSNa-DVB/St的比例等變因。利用TGA、Light scattering與FTIR測量親疏水接枝型共聚物的接枝率與乳膠系統的型態。

關鍵字

聚苯乙烯磺酸鈉 ； 活性自由基 ； 乳化聚合 ； 聚苯乙烯 ； 接枝共聚物

並列摘要

This work included two parts. First part was to synthesize a water-soluble living polymer, PSSNa with controlled molecular weight via TEMPO-mediated stable free radical polymerization with KPS as an initiator. The molecular weight, polydisperty and conversion of the living polymer were analyzed by GPC. The ratio of TEMPO to KPS or SSNa to KPS influenced the rate of polymerization and the molecular weight of the living polymer. Finally, the living polymer chains were terminated with divinylbenzene (DVB).
The second part was the polymerization of PSSNa with styrene by emulsion polymerization through the double bond of DVB at the chain end of the living polymer, PSSNa. A hydrophilic/hydrophobic graft copolymer, PSSNa-g-PS was obtained. Polymerization covers different condition: ultrasonic or not, the solvent system, reaction temperature, and the ratio of PSSNa-DVB to St. The grafting percentage of amiphiphilic copolymer and the size of latex were measured by TGA, Light scattering, and FTIR.

並列關鍵字

Living Free Radical ； Emulsion Polymerization ； Graf

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